reverse-text

Single-turn environment that asks the model to reverse a string character by character. Partial credit comes from a longest-common-subsequence ratio against the true reversal.

Overview

• Environment ID: reverse-text
• Short description: Reverse input text character-by-character with tagged output.
• Tags: single-turn, text, train, eval

Datasets

• Primary dataset(s): PrimeIntellect/Reverse-Text-RL train split
• Split sizes: full train split for task rows

Task

• Type: single-turn
• Output format expectations: answer inside <reversed_text>...</reversed_text> tags
• Scoring: LCS ratio between parsed answer and reversed input

Quickstart

prime env install reverse-text -p ./environments
prime eval run reverse-text

Configure model and sampling:

prime eval run reverse-text \
  -m openai/gpt-4.1-mini \
  -n 20 -r 3 -t 1024 -T 0.7

Metrics